作業三:太極

Load dbngraphics.dbn
size 300 300
paper 100
Repeat A 0 300
{
pen 0
line 0 A 100 A
}

Repeat A 0 150
{
pen 0
line 100 A 200 A
}


Repeat A 50 100
{
pen 100
line 50 A 100 A
}

Repeat A 200 250
{
pen 0
line 200 A 250 A
}